slstatus.c

   1 /* See LICENSE file for copyright and license details. */
   2
   3 /* global libraries */
   4 #include <alsa/asoundlib.h>
   5 #include <arpa/inet.h>
   6 #include <fcntl.h>
   7 #include <ifaddrs.h>
   8 #include <limits.h>
   9 #include <linux/wireless.h>
  10 #include <locale.h>
  11 #include <netdb.h>
  12 #include <pwd.h>
  13 #include <stdarg.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include <sys/ioctl.h>
  18 #include <sys/stat.h>
  19 #include <sys/statvfs.h>
  20 #include <sys/socket.h>
  21 #include <sys/sysinfo.h>
  22 #include <sys/types.h>
  23 #include <time.h>
  24 #include <unistd.h>
  25 #include <X11/Xlib.h>
  26
  27 #undef strlcat
  28 #undef strlcpy
  29
  30 #include "strlcat.h"
  31 #include "strlcpy.h"
  32
  33 /* statusbar configuration type and struct */
  34 typedef char *(*op_fun) (const char *);
  35 struct arg {
  36         op_fun func;
  37         const char *format;
  38         const char *args;
  39 };
  40
  41 /* function declarations */
  42 void setstatus(const char *str);
  43 char *smprintf(const char *fmt, ...);
  44 char *battery_perc(const char *battery);
  45 char *cpu_perc(const char *null);
  46 char *datetime(const char *timeformat);
  47 char *disk_free(const char *mountpoint);
  48 char *disk_perc(const char *mountpoint);
  49 char *disk_total(const char *mountpoint);
  50 char *disk_used(const char *mountpoint);
  51 char *entropy(const char *null);
  52 char *gid(const char *null);
  53 char *hostname(const char *null);
  54 char *ip(const char *interface);
  55 char *load_avg(const char *null);
  56 char *ram_free(const char *null);
  57 char *ram_perc(const char *null);
  58 char *ram_used(const char *null);
  59 char *ram_total(const char *null);
  60 char *run_command(const char *command);
  61 char *temp(const char *file);
  62 char *uid(const char *null);
  63 char *uptime(const char *null);
  64 char *username(const char *null);
  65 char *vol_perc(const char *soundcard);
  66 char *wifi_perc(const char *wificard);
  67 char *wifi_essid(const char *wificard);
  68
  69 /* global variables */
  70 static Display *dpy;
  71
  72 /* configuration header */
  73 #include "config.h"
  74
  75 /* set statusbar */
  76 void
  77 setstatus(const char *str)
  78 {
  79         /* set WM_NAME via X11 */
  80         XStoreName(dpy, DefaultRootWindow(dpy), str);
  81         XSync(dpy, False);
  82 }
  83
  84 /* smprintf function */
  85 char *
  86 smprintf(const char *fmt, ...)
  87 {
  88         va_list fmtargs;
  89         char *ret = NULL;
  90
  91         va_start(fmtargs, fmt);
  92         if (vasprintf(&ret, fmt, fmtargs) < 0)
  93                 return NULL;
  94         va_end(fmtargs);
  95
  96         return ret;
  97 }
  98
  99 /* battery percentage */
 100 char *
 101 battery_perc(const char *battery)
 102 {
 103         int now, full, perc;
 104         char batterynowfile[64] = "";
 105         char batteryfullfile[64] = "";
 106         FILE *fp;
 107
 108         /* generate battery nowfile path */
 109         strlcat(batterynowfile, batterypath, sizeof(batterynowfile));
 110         strlcat(batterynowfile, battery, sizeof(batterynowfile));
 111         strlcat(batterynowfile, "/", sizeof(batterynowfile));
 112         strlcat(batterynowfile, batterynow, sizeof(batterynowfile));
 113
 114         /* generate battery fullfile path */
 115         strlcat(batteryfullfile, batterypath, sizeof(batteryfullfile));
 116         strlcat(batteryfullfile, battery, sizeof(batteryfullfile));
 117         strlcat(batteryfullfile, "/", sizeof(batteryfullfile));
 118         strlcat(batteryfullfile, batteryfull, sizeof(batteryfullfile));
 119
 120         /* open battery now file */
 121         if (!(fp = fopen(batterynowfile, "r"))) {
 122                 fprintf(stderr, "Error opening battery file: %s.\n", batterynowfile);
 123                 return smprintf(unknowntext);
 124         }
 125
 126         /* read value */
 127         fscanf(fp, "%i", &now);
 128
 129         /* close battery now file */
 130         fclose(fp);
 131
 132         /* open battery full file */
 133         if (!(fp = fopen(batteryfullfile, "r"))) {
 134                 fprintf(stderr, "Error opening battery file.\n");
 135                 return smprintf(unknowntext);
 136         }
 137
 138         /* read value */
 139         fscanf(fp, "%i", &full);
 140
 141         /* close battery full file */
 142         fclose(fp);
 143
 144         /* calculate percent */
 145         perc = now / (full / 100);
 146
 147         /* return perc as string */
 148         return smprintf("%d%%", perc);
 149 }
 150
 151 /* cpu percentage */
 152 char *
 153 cpu_perc(const char *null)
 154 {
 155         int perc;
 156         long double a[4], b[4];
 157         FILE *fp;
 158
 159         /* open stat file */
 160         if (!(fp = fopen("/proc/stat","r"))) {
 161                 fprintf(stderr, "Error opening stat file.\n");
 162                 return smprintf(unknowntext);
 163         }
 164
 165         /* read values */
 166         fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
 167
 168         /* close stat file */
 169         fclose(fp);
 170
 171         /* wait a second (for avg values) */
 172         sleep(1);
 173
 174         /* open stat file */
 175         if (!(fp = fopen("/proc/stat","r"))) {
 176                 fprintf(stderr, "Error opening stat file.\n");
 177                 return smprintf(unknowntext);
 178         }
 179
 180         /* read values */
 181         fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
 182
 183         /* close stat file */
 184         fclose(fp);
 185
 186         /* calculate avg in this second */
 187         perc = 100 * ((b[0]+b[1]+b[2]) - (a[0]+a[1]+a[2])) / ((b[0]+b[1]+b[2]+b[3]) - (a[0]+a[1]+a[2]+a[3]));
 188
 189         /* return perc as string */
 190         return smprintf("%d%%", perc);
 191 }
 192
 193 /* date and time */
 194 char *
 195 datetime(const char *timeformat)
 196 {
 197         time_t tm;
 198         size_t bufsize = 64;
 199         char *buf = malloc(bufsize);
 200         if (buf == NULL) {
 201                 fprintf(stderr, "Failed to get date/time.\n");
 202                 return smprintf(unknowntext);
 203         }
 204
 205         /* get time in format */
 206         time(&tm);
 207         setlocale(LC_TIME, "");
 208         if (!strftime(buf, bufsize, timeformat, localtime(&tm))) {
 209                 setlocale(LC_TIME, "C");
 210                 free(buf);
 211                 fprintf(stderr, "Strftime failed.\n");
 212                 return smprintf(unknowntext);
 213         }
 214
 215         setlocale(LC_TIME, "C");
 216         /* return time */
 217         char *ret = smprintf("%s", buf);
 218         free(buf);
 219         return ret;
 220 }
 221
 222 /* disk free */
 223 char *
 224 disk_free(const char *mountpoint)
 225 {
 226         struct statvfs fs;
 227
 228         /* try to open mountpoint */
 229         if (statvfs(mountpoint, &fs) < 0) {
 230                 fprintf(stderr, "Could not get filesystem info.\n");
 231                 return smprintf(unknowntext);
 232         }
 233
 234         /* return free */
 235         return smprintf("%f", (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024);
 236 }
 237
 238 /* disk usage percentage */
 239 char *
 240 disk_perc(const char *mountpoint)
 241 {
 242         int perc = 0;
 243         struct statvfs fs;
 244
 245         /* try to open mountpoint */
 246         if (statvfs(mountpoint, &fs) < 0) {
 247                 fprintf(stderr, "Could not get filesystem info.\n");
 248                 return smprintf(unknowntext);
 249         }
 250
 251         /* calculate percent */
 252         perc = 100 * (1.0f - ((float)fs.f_bfree / (float)fs.f_blocks));
 253
 254         /* return perc */
 255         return smprintf("%d%%", perc);
 256 }
 257
 258 /* disk total */
 259 char *
 260 disk_total(const char *mountpoint)
 261 {
 262         struct statvfs fs;
 263
 264         /* try to open mountpoint */
 265         if (statvfs(mountpoint, &fs) < 0) {
 266                 fprintf(stderr, "Could not get filesystem info.\n");
 267                 return smprintf(unknowntext);
 268         }
 269
 270         /* return total */
 271         return smprintf("%f", (float)fs.f_bsize * (float)fs.f_blocks / 1024 / 1024 / 1024);
 272 }
 273
 274 /* disk used */
 275 char *
 276 disk_used(const char *mountpoint)
 277 {
 278         struct statvfs fs;
 279
 280         /* try to open mountpoint */
 281         if (statvfs(mountpoint, &fs) < 0) {
 282                 fprintf(stderr, "Could not get filesystem info.\n");
 283                 return smprintf(unknowntext);
 284         }
 285
 286         /* return used */
 287         return smprintf("%f", (float)fs.f_bsize * ((float)fs.f_blocks - (float)fs.f_bfree) / 1024 / 1024 / 1024);
 288 }
 289
 290 /* entropy available */
 291 char *
 292 entropy(const char *null)
 293 {
 294         int entropy = 0;
 295         FILE *fp;
 296
 297         /* open entropy file */
 298         if (!(fp = fopen("/proc/sys/kernel/random/entropy_avail", "r"))) {
 299                 fprintf(stderr, "Could not open entropy file.\n");
 300                 return smprintf(unknowntext);
 301         }
 302
 303         /* extract entropy */
 304         fscanf(fp, "%d", &entropy);
 305
 306         /* close entropy file */
 307         fclose(fp);
 308
 309         /* return entropy */
 310         return smprintf("%d", entropy);
 311 }
 312
 313 /* gid */
 314 char *
 315 gid(const char *null)
 316 {
 317         gid_t gid;
 318
 319         if ((gid = getgid()) < 0) {
 320                 fprintf(stderr, "Could no get gid.\n");
 321                 return smprintf(unknowntext);
 322         } else {
 323                 return smprintf("%d", gid);
 324         }
 325
 326         return smprintf(unknowntext);
 327 }
 328
 329 /* hostname */
 330 char *
 331 hostname(const char *null)
 332 {
 333         char hostname[HOST_NAME_MAX];
 334         FILE *fp;
 335
 336         /* open hostname file */
 337         if (!(fp = fopen("/proc/sys/kernel/hostname", "r"))) {
 338                 fprintf(stderr, "Could not open hostname file.\n");
 339                 return smprintf(unknowntext);
 340         }
 341
 342         /* extract hostname */
 343         fscanf(fp, "%s\n", hostname);
 344
 345         /* close hostname file */
 346         fclose(fp);
 347
 348         /* return entropy */
 349         return smprintf("%s", hostname);
 350 }
 351
 352 /* ip address */
 353 char *
 354 ip(const char *interface)
 355 {
 356         struct ifaddrs *ifaddr, *ifa;
 357         int s;
 358         char host[NI_MAXHOST];
 359
 360         /* check if getting ip address works */
 361         if (getifaddrs(&ifaddr) == -1) {
 362                 fprintf(stderr, "Error getting IP address.\n");
 363                 return smprintf(unknowntext);
 364         }
 365
 366         /* get the ip address */
 367         for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
 368                 if (ifa->ifa_addr == NULL)
 369                         continue;
 370
 371                 s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
 372
 373                 if ((strcmp(ifa->ifa_name, interface) == 0) && (ifa->ifa_addr->sa_family == AF_INET)) {
 374                         if (s != 0) {
 375                                 fprintf(stderr, "Error getting IP address.\n");
 376                                 return smprintf(unknowntext);
 377                         }
 378                         return smprintf("%s", host);
 379                 }
 380         }
 381
 382         /* free the address */
 383         freeifaddrs(ifaddr);
 384
 385         return smprintf(unknowntext);
 386 }
 387
 388 /* load avg */
 389 char *
 390 load_avg(const char *null)
 391 {
 392         double avgs[3];
 393
 394         /* try to get load avg */
 395         if (getloadavg(avgs, 3) < 0) {
 396                 fprintf(stderr, "Error getting load avg.\n");
 397                 return smprintf(unknowntext);
 398         }
 399
 400         /* return it */
 401         return smprintf("%.2f %.2f %.2f", avgs[0], avgs[1], avgs[2]);
 402 }
 403
 404 /* ram free */
 405 char *
 406 ram_free(const char *null)
 407 {
 408         long free;
 409         FILE *fp;
 410
 411         /* open meminfo file */
 412         if (!(fp = fopen("/proc/meminfo", "r"))) {
 413                 fprintf(stderr, "Error opening meminfo file.\n");
 414                 return smprintf(unknowntext);
 415         }
 416
 417         /* read the values */
 418         fscanf(fp, "MemFree: %ld kB\n", &free);
 419
 420         /* close meminfo file */
 421         fclose(fp);
 422
 423         /* return free ram as string */
 424         return smprintf("%f", (float)free / 1024 / 1024);
 425 }
 426
 427 /* ram percentage */
 428 char *
 429 ram_perc(const char *null)
 430 {
 431         int perc;
 432         long total, free, buffers, cached;
 433         FILE *fp;
 434
 435         /* open meminfo file */
 436         if (!(fp = fopen("/proc/meminfo", "r"))) {
 437                 fprintf(stderr, "Error opening meminfo file.\n");
 438                 return smprintf(unknowntext);
 439         }
 440
 441         /* read the values */
 442         fscanf(fp, "MemTotal: %ld kB\n", &total);
 443         fscanf(fp, "MemFree: %ld kB\n", &free);
 444         fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
 445         fscanf(fp, "Cached: %ld kB\n", &cached);
 446
 447         /* close meminfo file */
 448         fclose(fp);
 449
 450         /* calculate percentage */
 451         perc = 100 * ((total - free) - (buffers + cached)) / total;
 452
 453         /* return perc as string */
 454         return smprintf("%d%%", perc);
 455 }
 456
 457 /* ram total */
 458 char *
 459 ram_total(const char *null)
 460 {
 461         long total;
 462         FILE *fp;
 463
 464         /* open meminfo file */
 465         if (!(fp = fopen("/proc/meminfo", "r"))) {
 466                 fprintf(stderr, "Error opening meminfo file.\n");
 467                 return smprintf(unknowntext);
 468         }
 469
 470         /* read the values */
 471         fscanf(fp, "MemTotal: %ld kB\n", &total);
 472
 473         /* close meminfo file */
 474         fclose(fp);
 475
 476         /* return total ram as string */
 477         return smprintf("%f", (float)total / 1024 / 1024);
 478 }
 479
 480 /* ram used */
 481 char *
 482 ram_used(const char *null)
 483 {
 484         long free, total, buffers, cached, used;
 485         FILE *fp;
 486
 487         /* open meminfo file */
 488         if (!(fp = fopen("/proc/meminfo", "r"))) {
 489                 fprintf(stderr, "Error opening meminfo file.\n");
 490                 return smprintf(unknowntext);
 491         }
 492
 493         /* read the values */
 494         fscanf(fp, "MemTotal: %ld kB\n", &total);
 495         fscanf(fp, "MemFree: %ld kB\n", &free);
 496         fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
 497         fscanf(fp, "Cached: %ld kB\n", &cached);
 498
 499         /* close meminfo file */
 500         fclose(fp);
 501
 502         /* calculate used */
 503         used = total - free - buffers - cached;
 504
 505         /* return used ram as string */
 506         return smprintf("%f", (float)used / 1024 / 1024);
 507 }
 508
 509 /* custom shell command */
 510 char *
 511 run_command(const char* command)
 512 {
 513         int good;
 514         FILE *fp;
 515         char buffer[64];
 516
 517         /* try to open the command output */
 518         if (!(fp = popen(command, "r"))) {
 519                 fprintf(stderr, "Could not get command output for: %s.\n", command);
 520                 return smprintf(unknowntext);
 521         }
 522
 523         /* get command output text, save it to buffer */
 524         fgets(buffer, sizeof(buffer) - 1, fp);
 525
 526         /* close it again */
 527         pclose(fp);
 528
 529         /* add nullchar at the end */
 530         for (int i = 0 ; i != sizeof(buffer); i++) {
 531                 if (buffer[i] == '\0') {
 532                         good = 1;
 533                         break;
 534                 }
 535         }
 536         if (good)
 537                 buffer[strlen(buffer) - 1] = '\0';
 538
 539         /* return the output */
 540         return smprintf("%s", buffer);
 541 }
 542
 543 /* temperature */
 544 char *
 545 temp(const char *file)
 546 {
 547         int temperature;
 548         FILE *fp;
 549
 550         /* open temperature file */
 551         if (!(fp = fopen(file, "r"))) {
 552                 fprintf(stderr, "Could not open temperature file.\n");
 553                 return smprintf(unknowntext);
 554         }
 555
 556         /* extract temperature */
 557         fscanf(fp, "%d", &temperature);
 558
 559         /* close temperature file */
 560         fclose(fp);
 561
 562         /* return temperature in degrees */
 563         return smprintf("%d°C", temperature / 1000);
 564 }
 565
 566 /* uptime */
 567 char *
 568 uptime(const char *null)
 569 {
 570         struct sysinfo info;
 571         int hours = 0;
 572         int minutes = 0;
 573
 574         /* get info */
 575         sysinfo(&info);
 576         hours = info.uptime / 3600;
 577         minutes = (info.uptime - hours * 3600 ) / 60;
 578
 579         /* return it */
 580         return smprintf("%dh %dm", hours, minutes);
 581 }
 582
 583 /* username */
 584 char *
 585 username(const char *null)
 586 {
 587         register struct passwd *pw;
 588         register uid_t uid;
 589
 590         /* get the values */
 591         uid = geteuid();
 592         pw = getpwuid(uid);
 593
 594         /* if it worked, return */
 595         if (pw)
 596                 return smprintf("%s", pw->pw_name);
 597         else {
 598                 fprintf(stderr, "Could not get username.\n");
 599                 return smprintf(unknowntext);
 600         }
 601
 602         return smprintf(unknowntext);
 603 }
 604
 605 /* uid */
 606 char *
 607 uid(const char *null)
 608 {
 609         register uid_t uid;
 610
 611         /* get the values */
 612         uid = geteuid();
 613
 614         /* if it worked, return */
 615         if (uid)
 616                 return smprintf("%d", uid);
 617         else {
 618                 fprintf(stderr, "Could not get uid.\n");
 619                 return smprintf(unknowntext);
 620         }
 621
 622         return smprintf(unknowntext);
 623 }
 624
 625
 626 /* alsa volume percentage */
 627 char *
 628 vol_perc(const char *soundcard)
 629 {
 630         int mute = 0;
 631         long vol = 0, max = 0, min = 0;
 632         snd_mixer_t *handle;
 633         snd_mixer_elem_t *pcm_mixer, *mas_mixer;
 634         snd_mixer_selem_id_t *vol_info, *mute_info;
 635
 636         /* open everything */
 637         snd_mixer_open(&handle, 0);
 638         snd_mixer_attach(handle, soundcard);
 639         snd_mixer_selem_register(handle, NULL, NULL);
 640         snd_mixer_load(handle);
 641
 642         /* prepare everything */
 643         snd_mixer_selem_id_malloc(&vol_info);
 644         snd_mixer_selem_id_malloc(&mute_info);
 645         /* check */
 646         if (vol_info == NULL || mute_info == NULL) {
 647                 fprintf(stderr, "Could not get alsa volume.\n");
 648                 return smprintf(unknowntext);
 649         }
 650         snd_mixer_selem_id_set_name(vol_info, channel);
 651         snd_mixer_selem_id_set_name(mute_info, channel);
 652         pcm_mixer = snd_mixer_find_selem(handle, vol_info);
 653         mas_mixer = snd_mixer_find_selem(handle, mute_info);
 654
 655         /* get the info */
 656         snd_mixer_selem_get_playback_volume_range((snd_mixer_elem_t *)pcm_mixer, &min, &max);
 657         snd_mixer_selem_get_playback_volume((snd_mixer_elem_t *)pcm_mixer, SND_MIXER_SCHN_MONO, &vol);
 658         snd_mixer_selem_get_playback_switch(mas_mixer, SND_MIXER_SCHN_MONO, &mute);
 659
 660         /* clean up */
 661         if (vol_info)
 662                 snd_mixer_selem_id_free(vol_info);
 663         if (mute_info)
 664                 snd_mixer_selem_id_free(mute_info);
 665         if (handle)
 666                 snd_mixer_close(handle);
 667
 668         /* return the string (mute) */
 669         if (!mute)
 670                 return smprintf("mute");
 671         else
 672                 return smprintf("%d%%", (vol * 100) / max);
 673 }
 674
 675 /* wifi percentage */
 676 char *
 677 wifi_perc(const char *wificard)
 678 {
 679         int bufsize = 255;
 680         int strength;
 681         char buf[bufsize];
 682         char *datastart;
 683         char path[64];
 684         char status[5];
 685         char needle[sizeof wificard + 1];
 686         FILE *fp;
 687
 688         /* generate the path name */
 689         memset(path, 0, sizeof path);
 690         strlcat(path, "/sys/class/net/", sizeof(path));
 691         strlcat(path, wificard, sizeof(path));
 692         strlcat(path, "/operstate", sizeof(path));
 693
 694         /* open wifi file */
 695         if(!(fp = fopen(path, "r"))) {
 696                 fprintf(stderr, "Error opening wifi operstate file.\n");
 697                 return smprintf(unknowntext);
 698         }
 699
 700         /* read the status */
 701         fgets(status, 5, fp);
 702
 703         /* close wifi file */
 704         fclose(fp);
 705
 706         /* check if interface down */
 707         if(strcmp(status, "up\n") != 0)
 708                 return smprintf(unknowntext);
 709
 710         /* open wifi file */
 711         if (!(fp = fopen("/proc/net/wireless", "r"))) {
 712                 fprintf(stderr, "Error opening wireless file.\n");
 713                 return smprintf(unknowntext);
 714         }
 715
 716         /* extract the signal strength */
 717         strlcpy(needle, wificard, sizeof(needle));
 718         strlcat(needle, ":", sizeof(needle));
 719         fgets(buf, bufsize, fp);
 720         fgets(buf, bufsize, fp);
 721         fgets(buf, bufsize, fp);
 722         if ((datastart = strstr(buf, needle)) != NULL) {
 723                 datastart = strstr(buf, ":");
 724                 sscanf(datastart + 1, " %*d   %d  %*d  %*d                %*d      %*d          %*d              %*d      %*d            %*d", &strength);
 725         }
 726
 727         /* close wifi file */
 728         fclose(fp);
 729
 730         /* return strength in percent */
 731         return smprintf("%d%%", strength);
 732 }
 733
 734 /* wifi essid */
 735 char *
 736 wifi_essid(const char *wificard)
 737 {
 738         char id[IW_ESSID_MAX_SIZE+1];
 739         int sockfd;
 740         struct iwreq wreq;
 741
 742         /* prepare */
 743         memset(&wreq, 0, sizeof(struct iwreq));
 744         wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
 745
 746         /* set the interface */
 747         sprintf(wreq.ifr_name, wificard);
 748
 749         /* check */
 750         if((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
 751                 fprintf(stderr, "Cannot open socket for interface: %s\n", wificard);
 752                 return smprintf(unknowntext);
 753         }
 754         wreq.u.essid.pointer = id;
 755         if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
 756                 fprintf(stderr, "Get ESSID ioctl failed for interface %s\n", wificard);
 757                 return smprintf(unknowntext);
 758         }
 759
 760         /* return the essid */
 761         if (strcmp((char *)wreq.u.essid.pointer, "") == 0)
 762                 return smprintf(unknowntext);
 763         else
 764                 return smprintf("%s", (char *)wreq.u.essid.pointer);
 765 }
 766
 767 /* main function */
 768 int
 769 main(void)
 770 {
 771         char status_string[1024];
 772         struct arg argument;
 773
 774         /* try to open display */
 775         if (!(dpy = XOpenDisplay(0x0))) {
 776                 fprintf(stderr, "Cannot open display!\n");
 777                 exit(1);
 778         }
 779
 780         /* return status every interval */
 781         for (;;) {
 782                 /* clear the string */
 783                 memset(status_string, 0, sizeof(status_string));
 784
 785                 /* generate status_string */
 786                 for (size_t i = 0; i < sizeof(args) / sizeof(args[0]); ++i) {
 787                         argument = args[i];
 788                         char *res = argument.func(argument.args);
 789                         char *element = smprintf(argument.format, res);
 790                         if (element == NULL) {
 791                                 element = smprintf(unknowntext);
 792                                 fprintf(stderr, "Failed to format output.\n");
 793                         }
 794                         strlcat(status_string, element, sizeof(status_string));
 795                         free(res);
 796                         free(element);
 797                 }
 798
 799                 /* return the statusbar */
 800                 setstatus(status_string);
 801
 802                 /* wait, "update_interval - 1" because of get_cpu_usage() which uses 1 second */
 803                 sleep(update_interval -1);
 804         }
 805
 806         /* close display */
 807         XCloseDisplay(dpy);
 808
 809         /* exit successfully */
 810         return 0;
 811 }